Pump Control Quick Guide
18
In the following the requirements or conditions to deactivate an auxiliary pump are shown:
• Disconnection of an auxiliary pump
If the output frequency level of the regulated pump gets lower than the value stored in J36 during a time
longer than J37, the inverter will understand that the auxiliary pump is no longer needed and will begin a
disconnection process.
If the condition above is accomplished, the inverter will increase the output frequency of the regulated
pump until the frequency level specified by function code J94, by means of the acceleration ramp J40.
The frequency level when the auxiliary pumps are disconnected is defined by function code J41.
Figure 2.7: Disconnection of an auxiliary pump
The exact frequency level where the inverter disconnects the auxiliary pumps from the commercial power
supply is specified by means of the function code J41. The equation that defines this level is:
Frequency for disconnection of the auxiliary pumps (Hz)
( )
191918
100
41
JJJ
J
+
−×=
For example:
J41 = 40 %
J18 = 50 Hz
J19 = 25 Hz
Frequency for disconnection of the auxiliary pumps (Hz)
( )
Hz35252550
100
40
=+
−×=
In this case, the disconnection of the auxiliary pumps happens when the regulated pump is turning at 35
Hz.
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